Fuji Electric CR2L-300/UL | UL Recognized High-Current SCR Diode Module
The Fuji Electric CR2L-300/UL is a robust dual SCR (Silicon Controlled Rectifier) module engineered for high-power AC control applications. It provides a reliable, solid-state solution for phase-angle control and AC switching, replacing cumbersome mechanical contactors and less-integrated semiconductor setups. Designed for industrial environments, this module excels in applications such as motor soft starters, industrial heating controls, and static AC switches where precise power regulation and long-term reliability are non-negotiable.
Technical Deep Dive: Engineered for Industrial Resilience
The performance of the **CR2L-300/UL** is rooted in its fundamental design choices, which directly address common challenges in high-power systems.
- High dv/dt and di/dt Immunity: Industrial power lines are notoriously noisy. The CR2L-300/UL is designed with superior immunity to high rates of voltage change (dv/dt) and current change (di/dt).
- Technical Principle: This robustness stems from the carefully engineered gate structure and internal lifetime control of the silicon die. It prevents spurious, unintended turn-on events caused by voltage spikes or rapid load changes.
- Application Value: For system designers, this translates to exceptional reliability and reduced need for complex and costly external snubber circuits. Your system will operate predictably even in electrically harsh environments, minimizing downtime and maintenance calls.
- UL Recognized and Isolated Baseplate: Safety and ease of integration are paramount.
- Technical Principle: The module features an electrically isolated baseplate, typically using an Alumina (Al₂O₃) ceramic insulator, which provides high dielectric strength between the active semiconductor and the mounting heatsink. The **CR2L-300/UL** is UL Recognized (File No. E78996), confirming its compliance with stringent safety standards.
- Application Value: This simplifies thermal management by allowing multiple modules to be mounted on a common, non-isolated heatsink without complex insulating pads. The UL recognition streamlines the certification process for your end equipment, saving significant time and cost when bringing a product to the North American market.
Diverse Application Scenarios and Value Proposition
The **Fuji Electric CR2L-300/UL** delivers tangible benefits across a range of demanding applications:
- Motor Soft Starters: By utilizing a back-to-back SCR topology, this module smoothly ramps up voltage to large AC motors. This controlled start-up drastically reduces mechanical shock on gearboxes and conveyors and mitigates high inrush currents that can destabilize the power grid and trip breakers.
- Industrial Heater Control: In applications like industrial furnaces or plastic molding, precise temperature is key. The CR2L-300/UL enables highly accurate phase-angle control, delivering the exact amount of power required to maintain a stable temperature, improving product quality and energy efficiency compared to on/off control methods.
- Static AC Switches: For high-cycle applications where mechanical contactors would quickly fail, this SCR module offers a wear-free alternative. Its ability to switch large AC loads silently and rapidly makes it ideal for applications like large-scale lighting control or capacitor bank switching.
- Controlled Rectifiers: When used in a controlled bridge configuration, these modules are essential for high-current battery chargers and power supplies, providing regulated DC output from an AC source with proven ruggedness.
Key Technical Parameters Overview
This table summarizes the critical performance specifications for the CR2L-300/UL series. For detailed schematics and performance curves, always consult the official product datasheet.
| Parameter | Value |
|---|---|
| Repetitive Peak Off-State Voltage (VDRM/VRRM) | 1200V / 1600V Class |
| Average On-State Current (IT(AV)) | 300A |
| RMS On-State Current (IT(RMS)) | 471A |
| Surge Non-Repetitive On-State Current (ITSM) | 6000A (at 60Hz) |
| Critical Rate of Rise of On-State Current (di/dt) | 200 A/µs |
| Isolation Voltage (Viso) | 2500V (AC, 1 minute) |
Note: Parameters are typical and may vary based on the specific variant. Always refer to the official datasheet for precise values.
Frequently Asked Questions (FAQ)
- What is the primary advantage of the CR2L-300/UL over a mechanical contactor?
The main advantages are reliability and longevity. The CR2L-300/UL is a solid-state device with no moving parts, meaning it does not suffer from mechanical wear, contact bouncing, or arcing. This makes it vastly superior for applications requiring frequent switching, delivering a longer service life and silent operation. - Can this module be used as a freewheeling diode in an inverter?
No, this is a common point of confusion. The CR2L-300/UL is a phase-control thyristor (SCR), not a fast-recovery diode. It is designed for line-frequency (50/60Hz) AC control and lacks the high-speed turn-off characteristics required for freewheeling in modern high-frequency PWM inverters. For those applications, you would need dedicated Fast Recovery Diodes (FRDs) often found within IGBT power modules.
For robust and certified control of high-current AC loads in demanding industrial power electronics, the Fuji Electric CR2L-300/UL offers a field-proven and reliable solution. If your design requires high-power AC regulation, contact us for a quote or to discuss your specific application needs with our technical specialists.
